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ORPHA:268145

Classic maple syrup urine disease

high confidenceSubtype of disorder

Also known as: Classic BCKD deficiency · Classic MSUD · Classic branched-chain alpha-ketoacid dehydrogenase deficiency · Classic branched-chain ketoaciduria

Publications

145

61.2th percentile

Trials

0

Interventional, condition-specific

Researchers

868

Distinct authors in sample

Gene link

—

Readiness

2/6

Stages with a signal

Clinical definition (Orphanet)

Classic maple syrup urine disease (classic MSUD) is the most severe and probably common form of MSUD characterized by a maple syrup odor in the cerumen at birth, poor feeding, lethargy and focal dystonia, followed by and central respiratory failure if untreated.

How rare: How common this is has not been clearly measured.

Orphanet entry

Cross-references

Joined from Mondo / Orphanet. MeSH labels may enter searches; UMLS / OMIM / NCIT are stored for reference.

Additional Mondo synonyms (6)

classic BCKD deficiency · classic MSUD · classic branched-chain 2-ketoacid dehydrogenase deficiency · classic branched-chain alpha-ketoacid dehydrogenase deficiency · classic branched-chain ketoaciduria · classic maple syrup urine disease

Research stages

Trial readiness signals

Where this condition sits on an open-data research pipeline — not how close a treatment is, and not medical advice. Empty stages often mean “not in these databases under this Mondo ID,” not “impossible.”

2/6 stages with a signal

No specific-condition interventional trial, but broader-category trials exist — discuss eligibility with a clinician.

  1. Gene identifiedNot found

    No GenCC disease–gene assertion in this build

  2. LiteraturePresent

    145 matched papers (74 in last 10 years) Source

  3. Phenotype characterisedNot checked

    Not yet enriched from Monarch / HPO

  4. Animal modelNot checked

    Not yet enriched from Monarch / Alliance

  5. Orphan designationNot checked

    FDA/EMA orphan-drug designation not enriched yet

  6. Interventional trialPartial

    None under the specific name; 4 for broader category maple syrup urine disease

Biology

Genes and phenotypes

Gene–disease validity from GenCC, plus phenotypes and animal models joined from Monarch Initiative via Mondo ID — not a clinical diagnosis aid.

Do we know what causes it?

Not yet — the cause hasn't been pinned down in GenCC.

No strong gene–disease assertion joined for this Orphanet entity.

Phenotypes (Monarch / HPO)

Not enriched in this build — Monarch phenotype joins were not run for this record.

Animal models (Monarch / Alliance)

Not enriched in this build.

Literature

Is anyone studying this?

145

145 papers have ever been published on this condition (under this name). For scale, breast cancer has over 700,000. Median papers in the last 10 years for a rare disease in this dataset (publications denominator n=5449) is 41.

145 papers since the earliest indexed year in this search — median last-10-year count for a rare disease in this dataset is 41 (publications denominator n=5449).

74 in the last 10 years · high confidence · 61.2th percentile (publications denominator)

Phrase hits: 145 · MeSH hits: 0

Open Europe PMC search

Who's working on it?

868

Distinct author names in 145 sampled papers — named people below.

Who's working on it?

No interventional trial matched this name; these authors publish on it in the sampled literature — a practical starting point for contact.

  1. 01
    Chuang DT6 papers · 2025

    Department of Biochemistry, University of Texas Southwestern Medical School, Dallas, TX 75390, USA.

    Papers in Europe PMC
  2. 02
    Strauss KA5 papers · 2026

    Clinic for Special Children, Strasburg, PA.

    Papers in Europe PMC
  3. 03
    Brigatti KW4 papers · 2026

    Clinic for Special Children, Strasburg, PA, USA.

    Papers in Europe PMC
  4. 04
    Chuang JL4 papers · 2009

    Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, Texas 75235, USA.

    Papers in Europe PMC
  5. 05
    Harris RA4 papers · 1993
    Papers in Europe PMC
  6. 06
    Rodrigues A4 papers · 2026

    Clinic for Special Children, Strasburg, PA, USA.

    Papers in Europe PMC
  7. 07
    Wendel U4 papers · 2013
    Papers in Europe PMC
  8. 08
    Wynn RM4 papers · 2025

    Department of Biochemistry, University of Texas Southwestern Medical School, Dallas, TX 75390, USA.

    Papers in Europe PMC
  9. 09
    Alodaib A3 papers · 2025

    Discipline of Paediatrics and Child Health, University of Sydney, Sydney, Australia.

    Papers in Europe PMC
  10. 10
    Carson VJ3 papers · 2026

    Clinic for Special Children, Strasburg, PA, USA; Department of Pediatrics, Penn Medicine-Lancaster General Hospital, Lancaster, PA, USA.

    Papers in Europe PMC

Clinical research

Is a treatment being tested?

0

interventional trials for this specific condition

No interventional trial testing a treatment matched this specific condition name on ClinicalTrials.gov (observational studies and pan-disease registries are listed separately when present). 4 trials are registered for maple syrup urine disease, the broader category — shown separately because they may or may not enrol this specific subtype.

Data as of 27 July 2026

No matched interventional trials. This is true for 73% of diseases in the trials denominator (5114 of 7003). Here are the researchers publishing on it.

high confidence · 36.5th percentile (trials denominator)

Recruiting interventional trials

From the matched ClinicalTrials.gov set

No interventional trial testing a treatment was found for this specific condition name on ClinicalTrials.gov.

4 interventional trials matched maple syrup urine disease, the broader category — listed below. Those studies are not counted in the condition-specific total.

Broader category: maple syrup urine disease

4

Interventional trials for the parent category, exclusive of NCT IDs already counted above. Eligibility for this subtype is not guaranteed.

Worth raising with a clinician. How we count trials.

Recruiting under the broader category

Where to find support

We do not yet link condition-specific patient organisations. These umbrella groups support undiagnosed and ultra-rare families:

India — NPRD

Last verified 2026-07-26

Likely covered — the policy lists Maple syrup urine disease (MSUD) as a category (Groups 1 and 2), and this condition is a form of it. Confirm eligibility with a Centre of Excellence.

Group 1 — one-time curative treatment

Up to ₹50 lakh per patient

Financial support for treatment at notified Centres of Excellence (figures evolved from the original ₹20 lakh Group-1 ceiling).

Policy figures change. Verify current MoHFW / CoE guidance before relying on any amount. Verify

Group 2 — long-term / lifelong lower-cost interventions

NPRD envisages State Government support for dietary formulae, hormones, and other lower-cost interventions. This is a different route from the central CoE ₹50 lakh pathway; ask your state health department and a CoE which channel applies.

Central CoE funding may also apply depending on current rules — confirm with a notified Centre of Excellence. Do not assume the ₹50 lakh ceiling covers Group 2 by default. Verify

Centres of Excellence (15)
  • All India Institute of Medical Sciences (AIIMS) — New Delhi, Delhi
  • Maulana Azad Medical College — New Delhi, Delhi
  • Sanjay Gandhi Post Graduate Institute of Medical Sciences — Lucknow, Uttar Pradesh
  • Post Graduate Institute of Medical Education and Research (PGIMER) — Chandigarh, Chandigarh
  • Centre for DNA Fingerprinting & Diagnostics with Nizam’s Institute of Medical Sciences — Hyderabad, Telangana
  • King Edward Memorial Hospital — Mumbai, Maharashtra
  • Institute of Post-Graduate Medical Education and Research (IPGMER) — Kolkata, West Bengal
  • Centre for Human Genetics with Indira Gandhi Hospital — Bengaluru, Karnataka
  • Institute of Child Health and Hospital for Children (ICH & HC) — Chennai, Tamil Nadu
  • All India Institute of Medical Sciences (AIIMS) — Jodhpur, Rajasthan
  • Sree Avittam Thirunal Hospital (SAT), Government Medical College — Thiruvananthapuram, Kerala
  • All India Institute of Medical Sciences (AIIMS) — Bhopal, Madhya Pradesh
  • Regional Institute of Medical Sciences (RIMS) — Imphal, Manipur
  • All India Institute of Medical Sciences (AIIMS) — Patna, Bihar
  • Assam Medical College & Hospital — Dibrugarh, Assam

Voluntary contributions / crowdfunding (separate from CoE funding): https://rarediseases.mohfw.gov.in/

Hand-curated for this project. ORPHAcode mappings are best-effort and may be incomplete or imprecise for umbrella categories. Parent (Mondo) matches mean the policy lists a broader category — confirm eligibility with a Centre of Excellence. Financial entitlements summarised from public policy statements and may change. This is not official government guidance.

How we counted this

Europe PMC query (preferred label + any corrected label + Orphanet and Mondo exact synonyms, stoplisted; unioned with resolved MeSH labels when available). UMLS / OMIM / NCIT cross-references are stored on the overview but are not added to the query string.

"Classic maple syrup urine disease" OR "Classic BCKD deficiency" OR "Classic MSUD" OR "Classic branched-chain alpha-ketoacid dehydrogenase deficiency" OR "Classic branched-chain ketoaciduria" OR "classic branched-chain 2-ketoacid dehydrogenase deficiency"

Run this search on Europe PMC

ClinicalTrials.gov query (quoted phrases + MeSH via query.cond, plus recall-expansion terms when used):

"Classic maple syrup urine disease" OR "Classic BCKD deficiency" OR "Classic MSUD" OR "Classic branched-chain alpha-ketoacid dehydrogenase deficiency" OR "Classic branched-chain ketoaciduria" OR "classic branched-chain 2-ketoacid dehydrogenase deficiency"

Study-type breakdown: 0 interventional · 0 observational · 0 expanded access. Only interventional studies enter the trial headline.

Parent-category trials query:

"maple syrup urine disease"

Query health: ok — strategies attempted: phrase; with hits: phrase

Run this search on ClinicalTrials.gov

Confidence reasoning

  • Preferred label is multi-word and distinctive
  • No synonyms dropped by stoplist
  • No label/synonym collisions with other diseases in this corpus

Ingested 2026-07-27T11:28:26.228Z